data is raw facts and figures data on its own has no meaning some examples d2d4, wig, b2.2, 456 logical or boolean •Data stored in boolean form can only be one of two available values. •Think of a light switch – it’s on or off. •Examples include: yes , no , true ,false , 0 ,1 m, f Alphanumeric •Alphanumeric data is any combination of letters, numbers and symbols (@#¬|\/>< etc.) •This data type is also known as a string or text. •Examples: i like fish , DL61ABC ,@*!# •Alphanumeric or text/string is used to hold telephone numbers. •In a computer, telephone numbers are stored as text. •This is because the telephone number contains a leading zero and spaces Real a real number is one which has decimal places . e.g. 12.4 18.01 Integer integer numbers are whole numbers , no bits ,no decimal places. e.g. 5 , -54 , 999999 Date dates can be stored in many different forms. in the UK we write the data in the form DD/MM/YYYY e.g. 31/12/2014. in the us they use the form MM/DD/YYYY e.g. 12/31/2014. e.g. 15/08/1999 , 2009/11/30 other data types
•Currency – Software will automatically add £ or $ to data and include decimal places. E.g. £22.99. •Images/Sound Bites/Video Clips – Some databases will allow an images, sound and video clips to be stored. For example a photo of a criminal and their fingerprints on a crime database. |
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